Related Clues:

• Boy comes up on track, not taking a breather
• Towards the top, it's on either side of right and left, and it smells
• Nose aperture
• Engineer lost in going round route initially -- it's one of two passages
• Opening next to the septum
• It may be blocked, flared or pierced
• Criminal sort in jail's last bit of snout
• Opening section of piano’s trill
• Aperture in 6dn
• Punched by right, bewildered Liston gets breathing space
• Tube of the nose
• Part of breathing apparatus is torn foolishly by learner
• Air hole?